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1. One brand of cleaner used to etch concrete is 25% acid. A stronger industrial-strength cleaner is 50% acid. How many galloons of each cleaner should be mixed to produce 20 galloons of a 40% acid solution?

2. You have some coins, each of which is a penny (1 cent), a nickel (5 cents), a dime (10 cents), or a quarter (25 cents). You know that • you have twice as many pennies as nickels, • the number of dimes is one more than the number of pennies and nickels combined, you have 34 coins in total, • and the total value of your coins is $2.70 (270 cents). (a) Set up a system of linear equations for the numbers of pennies, nickels, dimes, and quarters you have. (b) Determine how many coins of each type you have, by solving the system from part (a).

4. Solve. Find all the solutions for each question

5. Solve 4cos²0 - 1 = 0 and write the general solution.

23) Max and Jill both uses quarters to fill a parking meter. Max's parking meter is for 2 hours and Jill's parking meter is for 1 hour and 30 minutes. Max goes into a store and when he comes back, he sees that his parking meter has 4 of the time left. Jill goes for a run and when she comes back she sees that her parking meter has 4 of the time left. Who has more time left? By how many minutes?

5) C for B. Solve D-A

7. Find the solution. (x + 1)² + 5 = 69

1 2 -3 5 1 4 -6 | 0 000 14) 0 Write the solution as an ordered triple, if possible.

Mead. , Two-step equations Wednesdby 10 10 Two-step equations - integers Solve each equation. 1) -5n + 8 =-7 2) 28 =-2- 5.x 4) -10a – 5 = 135 3) 2=7+- 6) +9 = 2 5) 13 = + 8